CN112134261A - Continuous overload protection and power device cooling control method - Google Patents
Continuous overload protection and power device cooling control method Download PDFInfo
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- CN112134261A CN112134261A CN202010879011.7A CN202010879011A CN112134261A CN 112134261 A CN112134261 A CN 112134261A CN 202010879011 A CN202010879011 A CN 202010879011A CN 112134261 A CN112134261 A CN 112134261A
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- 238000001816 cooling Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
- H02H7/205—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
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Abstract
The application relates to a continuous overload protection and power device cooling control method, which relates to the technical field of device protection methods and comprises the following steps: s1: acquiring a first temperature signal a output by a temperature sensor; s2: acquiring a protection temperature signal b, comparing the protection temperature signal b with the first temperature signal a, and executing S3 when the first temperature signal a is greater than the protection temperature signal b; s3: entering a thermal protection state, adding one to the thermal protection times, comparing the thermal protection times with a preset time, executing S4 when the thermal protection times are greater than the preset time, and executing S5 when the thermal protection times are less than the preset time; s4: creating a timer, and executing S5 when the timing is finished; s5: and comparing the first temperature signal a output by the current temperature sensor with the protection temperature signal b, and continuously keeping the thermal protection state when the first temperature signal a is greater than the protection temperature signal b. The temperature sampling device has the advantages that the temperature of the key power device of the product can be controlled to safely and reliably operate through single-point temperature sampling.
Description
Technical Field
The application relates to the technical field of device protection methods, in particular to a continuous overload protection and power device cooling control method.
Background
At present, the product is used under different environmental temperatures and the heavy current load is continuously overloaded, so that the heat dissipation difference of different positions of a power device is caused, the heating and cooling are different, and the temperature accumulation rise and the cooling time are different.
In actual production, in order to ensure the reliability of product quality, a plurality of temperature detection protection circuits need to be added, or the specification of a power device needs to be increased.
The above prior art solutions have the following drawbacks: the inventor believes that the cost is high because of the increase of a plurality of temperature detection devices and protection circuits, or the increase of the specification of power devices, which generally increases the related wire harness and circuit devices.
Disclosure of Invention
In order to reduce the number of temperature detection devices and protection circuits arranged on a power device, the application provides a continuous overload protection and power device cooling control method.
The application provides a continuous overload protection and power device cooling control method, which adopts the following technical scheme:
a continuous overload protection and power device cooling control method comprises the following steps:
s1: acquiring a first temperature signal a for measuring the output of a temperature sensor of a power device;
s2: acquiring a protection temperature signal b of the power device, comparing the protection temperature signal b with the first temperature signal a, continuing normal operation when the first temperature signal a is smaller than the protection temperature signal b, and executing S3 when the first temperature signal a is larger than the protection temperature signal b;
s3: entering a thermal protection state, adding one to the thermal protection times, comparing the thermal protection times with a preset time, executing S4 when the thermal protection times are greater than the preset time, and executing S5 when the thermal protection times are less than the preset time;
s4: creating a timer, wherein before the time counting of the timer is finished, the product is in a thermal protection state, and when the time counting is finished, executing S5; and
s5: comparing a first temperature signal a output by the current temperature sensor with a protection temperature signal b, entering a normal working state when the first temperature signal a is smaller than the protection temperature signal b, and keeping a thermal protection state when the first temperature signal a is larger than the protection temperature signal b until the first temperature signal a is smaller than the protection temperature signal b.
By adopting the technical scheme, only one temperature sampling point, the temperature detection device, the protection circuit, the related wire harness and the related circuit device are needed, the circuit is simple, and the cost is low; by the method, after the preset times, the product is in a cooling state within the timing time of the timer, so that the probability of the phenomenon of overhigh temperature of the product is reduced, and meanwhile, the reliability of the product quality can be improved; in steps S4 and S5, it is necessary to satisfy both the end of the timer period and the first temperature signal a being less than the protection temperature signal b to enter the normal operation state.
Preferably, an S0 step is further provided before the S1 step,
s0: and acquiring heating temperature data of the power devices under the working environments of 0 degree, 20 degrees and 40 degrees respectively, outputting and testing under the maximum full load, and testing the heating condition of each power device and cooling the devices to the proper temperature at rest.
By adopting the technical scheme, the heating condition of each power device and the rest cooling of the device to the proper temperature and at least the rest cooling time are obtained through the step of S0, so that the safe and reliable operation of the temperature of the key power device of a single-point temperature sampling control product is realized.
Preferably, in step S0, the power device includes a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, and a fast recovery diode.
By adopting the technical scheme, the product mainly comprises the power device.
Preferably, one of the power devices is selected as a critical power device in step S0, and the critical power device temperature protection parameter and the cooling recovery temperature parameter are set, and the cooling forced rest cooling time of the other power devices is set.
By adopting the technical scheme, one power device is selected as the most critical power device and the most temperature acquisition point, so that the safe and reliable operation of the temperature of the critical power device of the product can be conveniently controlled.
Preferably, the temperature sensor in step S1 is used to detect the current temperature of the most critical power device.
By adopting the technical scheme, the temperature sensor is used for acquiring the current temperature of the most critical power device so as to judge whether the current product needs to enter a thermal protection state.
Preferably, the preset number of times in the step of S3 is set to 5 to 7 times.
By adopting the technical scheme, after entering the thermal protection state for many times, the temperatures of other power devices are increased in an accumulated manner, and when the power device is continuously overloaded for a long time, the temperature can exceed the safe operation temperature of the related devices, so that the service life and the reliability of the product devices are reduced, and the cooling time is prolonged after 5-7 times, thereby being beneficial to cooling of other power devices.
Preferably, the timing time of the timer in the step S4 is set to 2min to 11 min.
By adopting the technical scheme, the time of the timer is beneficial to cooling other power devices, and the phenomenon of overhigh temperature is reduced.
Preferably, the first temperature signal a in the step S1 is converted into a voltage signal, the protection temperature signal b in the step S2 is set as the voltage signal, and the first temperature signal a and the protection temperature signal b in the steps S2 and S5 are compared by a comparator.
Through adopting above-mentioned technical scheme, compare first temperature signal a and protection temperature signal b through the comparator, easy operation easily realizes.
Preferably, the number of times of thermal protection in step S3 is added by an adder.
By adopting the technical scheme, the adder is convenient for realizing the addition of one to the thermal protection times, and is simple to operate and easy to realize.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the temperature of a key power device of a product is controlled to run safely and reliably by single-point temperature sampling, and the number of temperature detection devices, protection circuits, related wire harnesses and circuit devices is small, so that the circuit is simple and the cost is low; the phenomenon that other power devices are high in temperature is reduced through the arrangement of the timer.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application discloses a continuous overload protection and power device cooling control method. Referring to fig. 1, the specific method is as follows:
s0: the method comprises the steps of collecting heating temperature data of power devices in working environments of 0 degree, 20 degrees and 40 degrees respectively, outputting a test under the maximum full load, testing the heating condition of each power device and cooling the device to a proper temperature in a rest mode, and obtaining the minimum value of the rest cooling time under different environments through repeated multi-round heating balance verification so as to control the safe and reliable operation of the temperature of all key power devices.
S1: a first temperature signal a for measuring the output of a temperature sensor of a power device is acquired.
S2: and acquiring a protection temperature signal b of the power device, comparing the protection temperature signal b with the first temperature signal a, continuing normal operation when the first temperature signal a is smaller than the protection temperature signal b, and executing S3 when the first temperature signal a is larger than the protection temperature signal b.
S3: entering a thermal protection state, adding one to the thermal protection times, comparing the thermal protection times with a preset time, executing S4 when the thermal protection times is greater than the preset time, and executing S5 when the thermal protection times is less than the preset time.
S4: creating a timer, wherein the product is always in a thermal protection state before the timer finishes timing, and executing S5 when the timing finishes.
S5: comparing a first temperature signal a output by the current temperature sensor with a protection temperature signal b, entering a normal working state when the first temperature signal a is smaller than the protection temperature signal b, and continuously keeping a thermal protection state when the first temperature signal a is larger than the protection temperature signal b until the first temperature signal a is smaller than the protection temperature signal b.
In step S0, the power device includes a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, and a fast recovery diode.
And selecting one power device as the most critical power device in the step S0, and setting the temperature protection parameter of the most critical power device and the cooling recovery temperature parameter, and cooling other devices for at least forced rest cooling time.
Specifically, in step S0, the product operates at a rated maximum output in an environment of 40 degrees, the temperature heating conditions (such as a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, a fast recovery diode, and the like) of key components are monitored, a most critical point device protection parameter is set, the device is detected, collected and protected, and through a large amount of data, it is determined that other key components are in the environment of 40 degrees, at least a rest cooling time value parameter is protected, and it is ensured that other components without protection points operate in a safe range during the next operating cycle to protection. Such as: the fast recovery diode is used as the most key point device, the protection temperature is 90 degrees, the recovery temperature is 50 degrees, the average working time is about 2 minutes and a half after data acquisition, the fast recovery diode is reduced to 50 degrees, only 3-4 minutes are needed, and at least 5 minutes are needed for rest and temperature reduction of other devices.
The product is operated at a rated maximum output under the environment of 20 degrees, the temperature heating condition of key components (a switch, a rectifier bridge, an electrolytic capacitor, an IGBT (insulated gate bipolar transistor), a main transformer, a fast recovery diode and the like) is monitored, a most key point device protection parameter is set, the device is detected, collected and protected, a large amount of data is used for obtaining background, other key components are determined to be under the environment of 20 degrees, at least, the rest and cooling time value parameter is protected, and it is guaranteed that when the next working operation period reaches the protection period, other components without protection points are all operated in a safety range. Such as: the fast recovery diode is used as the most key point device, the protection temperature is 90 degrees, the recovery temperature is 50 degrees, the average working time is about 6 minutes after data acquisition, the fast recovery diode is reduced to 50 degrees, only 1-2 minutes are needed, and the rest and temperature reduction time value of other devices is at least 3 minutes.
The product is under 0 degree environment, the rated maximum output operation, the monitoring key components and parts temperature condition of generating heat (switch, rectifier bridge, electrolytic capacitor, IGBT, main transformer, fast recovery diode etc.), set for a most key point device protection parameter, detect acquisition protection to this device, through a large amount of data groping, confirm other key components and parts under 0 degree environment, protect at least and have a rest and cool down time value parameter, guarantee when next duty cycle to protection, other components and parts that do not set up the protection point all work in the safety range. Such as: the fast recovery diode is used as the most key point device, the protection temperature is 90 degrees, the recovery temperature is 50 degrees, the average working time is about 15 minutes after data acquisition, the fast recovery diode is reduced to 50 degrees, only 30-60 seconds are needed, and at least 1.5 minutes are needed for rest and temperature reduction of other devices.
Experiments prove that when the device works in the environments of 0 degree, 20 degrees and 40 degrees and works in a cold state, the device can continuously repeat 8 cycles according to protection (90 degrees) and recovery (50 degrees) of protection point parameters, wherein the work, protection, recovery work, protection, recovery work and protection are carried out, the temperature of related key components is in a safety range, when the device exceeds the 9 th cycle and continuously overloads, the rest time is short, the temperature of other devices without protection points can be increased in an accumulated mode, when the device exceeds the safe operation temperature of related devices and is continuously overloaded for a long time, the service life and the reliability of product devices can be reduced.
The temperature sensor in step S1 is used to detect the current temperature of the most critical power device.
The preset number of times in the step S3 is set to 5 to 7 times, and the present embodiment is preferably 6 times.
The timing time of the timer in the step S4 is set to 2min to 11min, and the present embodiment is preferably 5 min.
The first temperature signal a in the step S1 is converted into a voltage signal, the protection temperature signal b in the step S2 is set as a voltage signal, and the first temperature signal a and the protection temperature signal b in the steps S2 and S5 are compared by a comparator; the number of times of thermal protection plus one in the step S3 is accumulated by the adder.
The implementation principle of the continuous overload protection and power device cooling control method in the embodiment of the application is as follows: the method comprises the steps of carrying out output test under the maximum full load, obtaining the heating condition of each power device and the rest cooling of the devices to the proper temperature, obtaining at least rest cooling time under different environments through repeated multi-round heating balance verification to control the safe and reliable operation of the temperature of all key power devices, setting a most key power device temperature protection parameter and a cooling recovery temperature parameter, and cooling other devices for at least forced rest cooling time, thereby ensuring that the temperature of key components is in a safe range when the devices are operated to be protected in the next period. The safe and reliable operation of the temperature of a key power device of a control product is realized through one temperature control sampling point. Experiments show that the rated load holding rate is respectively tested at the environmental temperatures of 40 ℃, 20 ℃ and 0 ℃, the test of continuous overload is carried out for 800 hours at the environmental temperatures of 4 hours and 40 ℃ when 100% of full load continuously works, and the expected effect is achieved after the test is passed.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A continuous overload protection and power device cooling control method is characterized in that: the method comprises the following steps:
s1: acquiring a first temperature signal a for measuring the output of a temperature sensor of a power device;
s2: acquiring a protection temperature signal b of the power device, comparing the protection temperature signal b with the first temperature signal a, continuing normal operation when the first temperature signal a is smaller than the protection temperature signal b, and executing S3 when the first temperature signal a is larger than the protection temperature signal b;
s3: entering a thermal protection state, adding one to the thermal protection times, comparing the thermal protection times with a preset time, executing S4 when the thermal protection times are greater than the preset time, and executing S5 when the thermal protection times are less than the preset time;
s4: creating a timer, wherein before the time counting of the timer is finished, the product is in a thermal protection state, and when the time counting is finished, executing S5; and
s5: comparing a first temperature signal a output by the current temperature sensor with a protection temperature signal b, entering a normal working state when the first temperature signal a is smaller than the protection temperature signal b, and keeping a thermal protection state when the first temperature signal a is larger than the protection temperature signal b until the first temperature signal a is smaller than the protection temperature signal b.
2. The continuous overload protection and power device cooling control method according to claim 1, wherein: an S0 step is also provided before the S1 step,
s0: and acquiring heating temperature data of the power devices under the working environments of 0 degree, 20 degrees and 40 degrees respectively, outputting and testing under the maximum full load, and testing the heating condition of each power device and cooling the devices to the proper temperature at rest.
3. The continuous overload protection and power device cooling control method according to claim 2, wherein: in step S0, the power device includes a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, and a fast recovery diode.
4. The continuous overload protection and power device cooling control method according to claim 3, wherein: in step S0, one of the power devices is selected as a critical power device, and the critical power device temperature protection parameter and the cooling recovery temperature parameter are set, and the cooling forced rest cooling time of the other power devices is set.
5. The continuous overload protection and power device cooling control method according to claim 4, wherein the method comprises the following steps: the temperature sensor in step S1 is used to detect the current temperature of the critical power device.
6. The continuous overload protection and power device cooling control method according to claim 1, wherein: the preset number of times in the step S3 is set to 5-7 times.
7. The continuous overload protection and power device cooling control method according to claim 1, wherein: the timing time of the timer in the step S4 is set to 2min to 11 min.
8. The continuous overload protection and power device cooling control method according to claim 1, wherein: the first temperature signal a in the step S1 is converted into a voltage signal, the protection temperature signal b in the step S2 is set as a voltage signal, and the first temperature signal a and the protection temperature signal b in the steps S2 and S5 are compared by a comparator.
9. The continuous overload protection and power device cooling control method according to claim 1, wherein: the number of times of thermal protection plus one in the step S3 is accumulated by the adder.
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| CN202010879011.7A CN112134261B (en) | 2020-08-27 | 2020-08-27 | Continuous overload protection and power device cooling control method |
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